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| | Pioneer 10 |
 | | Launched on March 2, 1972, Pioneer 10 was the first spacecraft to travel through the asteroid belt, the first spacecraft to make direct observations of Jupiter and in 1983, it became the first man-made object to leave the solar system when it passed the orbit of Pluto. |
 | | Pioneer 10 was eleven light-hours away at this point, and so it was twenty-two hours later when researchers at the network's facility in Madrid, Spain, heard Pioneer's response. |
 | | As of February 5, 2002, Pioneer 10 was 79.66 AU from the Sun. |
| www.ebroadcast.com.au /lookup/encyclopedia/pi/Pioneer_10.html (456 words) |
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